EP2621330B1 - Procédé et dispositif pour la détermination interférométrique de différents paramètres biométriques d'un il - Google Patents

Procédé et dispositif pour la détermination interférométrique de différents paramètres biométriques d'un il Download PDF

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Publication number
EP2621330B1
EP2621330B1 EP11764503.6A EP11764503A EP2621330B1 EP 2621330 B1 EP2621330 B1 EP 2621330B1 EP 11764503 A EP11764503 A EP 11764503A EP 2621330 B1 EP2621330 B1 EP 2621330B1
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Prior art keywords
eye
fixation
measurement
light source
light
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German (de)
English (en)
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EP2621330A1 (fr
Inventor
Tobias Schmitt-Manderbach
Daniel Bublitz
Roland Bergner
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Carl Zeiss Meditec AG
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Carl Zeiss Meditec AG
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/18—Eye characteristics, e.g. of the iris
    • G06V40/193—Preprocessing; Feature extraction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/1005—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring distances inside the eye, e.g. thickness of the cornea
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/11—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/0209—Low-coherence interferometers
    • G01B9/02091—Tomographic interferometers, e.g. based on optical coherence
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/113—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining or recording eye movement

Definitions

  • the present invention relates to a solution for the interferometric determination of various biometric parameters of an eye, in which the optical axis of the biometric measuring system is aligned with the optical axis of an eye and ideally coincides with it.
  • the visual axis of the eye is characterized by the straight line between the centers of curvature of refracting surfaces
  • the visual axis extends from the fovea centralis through the nodal point of the eye to the fixation object. If the various media are reduced to a single medium-refractive medium with spherical curvature by calculation, one can indicate a point in the eye through which all rays pass uninterrupted. This point is called the node of the visual axes.
  • the visual axis usually deviates from the optical axis in all eyes. This results, on the one hand, from aberrations of the eye resulting, for example, from the fact that radii of curvature of the individual eye media are not uniform, the eye lens is tilted, the retina is not in the focus of the eye lens and much more. On the other hand, when the eye is aimed at an object, it is attempted to image it, if possible in the fovea, as the area of the sharpest vision.
  • the determination of different biometric parameters of an eye is required in particular prior to surgery for the replacement of the lens in the presence of lens opacification (cataract). In order to ensure optimal vision after surgery, it is necessary to determine these parameters with a correspondingly high degree of accuracy, in order then to be able to select a suitable replacement lens based on the measured values determined.
  • the most important parameters to be determined are u. a. the axial length (distance from the cornea to the retina), the corneal curvature and refractive power, and the length of the anterior chamber (distance from the cornea to the lens of the eye).
  • the optical axis of the ophthalmological measuring arrangement and the optical axis of the eye to be measured are aligned with one another and ideally coincide.
  • a first arrangement for the interferometric measurement of the distances of the anterior segment of the eye is described by Drexler, W. and others in [1].
  • Drexler, W. and others For aligning the visual axis of the eye on the optical axis of the measuring arrangement, a collimated fixing light along a fixed, coaxial direction is reflected in the measuring beam path.
  • the adjustment of the angle between the visual axis of the patient and the optical axis of the measuring arrangement takes place with the aid of a scanning mirror.
  • the alignment of the two axes must be done with an accuracy of better than 1 °, otherwise no Overlap of corneal and lens reflex results on the detector and no evaluable interference signal arises.
  • the sensitivity of the structure to tilting of the patient's eye is correspondingly high.
  • the position of the visual axis of the eye is determined by scanning over a predetermined angular range in two orthogonal spatial directions. The method described here is very time-consuming and also not reliable enough for everyday clinical practice.
  • Another solution for determining distances at the front eye portion, preferably the pupil and / or iris diameter is in the DE 101 08 797 A1 described.
  • the subject is offered a light brand on which he fixes his eye. The operator can visually verify that the subject is properly fixed throughout the time of adjustment and measurement.
  • the visual axis and the optical axis can deviate from each other by up to 8 ° in real eyes, since the fovea can be temporally offset from 3 ° nasal to 8 °. Accordingly, it may be advantageous to offer the subject an offset fixation light.
  • the alignment of both axes with each other must be done with high accuracy. This is of particular importance here, since in the determination of pupil and / or iris diameter not scattered but reflected light is detected.
  • the measuring light components reflected from different boundary surfaces in the eye generate the interference signal, that is to say no external reference light is used to generate the interference contrast.
  • the photodetector only a non-diffraction limited reflection of the reflected light can be selected on the photodetector, so that only specular (Fresnel) reflections contribute to the interference signal.
  • speckles caused by volume scattered light are much smaller in the detector plane than the detector surface and are therefore "averaged out” over the detector surface. Due to this fact, the measuring method continues to rely on a generally very precise pre-adjustment on the visual axis of the patient's eye.
  • Findings from practice have surprisingly shown that it in the vicinity of the so-called gloss angle to an increased intensity of Backscatter is coming.
  • the volume scattered light generated is utilized, which uniformly remits substantially in all directions, an at least rough pre-adjustment of the optical axis of the ophthalmological measuring device with respect to the visual axis would thus lead to significantly improved measurement results.
  • FIG. 1 shows the intensity profile of the scattered back from an interface in the eye light components as a function of the scattering angle. It can be seen that the backscattered light components in a narrow range around the so-called glancing angle have a much higher intensity than in the remaining area.
  • a sufficiently good alignment of the optical axis of an interferometric measuring arrangement with respect to the optical axis of an eye is preferably carried out automatically, wherein both tilting or lateral displacements of the eye of the patient as well as his refractive error in the alignment should be considered.
  • the inventive device for interferometric determination of various biometric parameters of an eye consisting of an interferometric measuring device, a measuring light source for illuminating an eye with measuring light, a Fixierlichtán for illuminating the eye with a fixation, an image sensor for receiving the eye with the resulting reflections and a Evaluation unit for determining the angular deviation of the optical axis of the eye from the optical axis of the biometric measuring system, the object is achieved in that the fixing light source is formed so that the fixation mark to be generated is laterally displaceable, an existing optics is formed so that in the first Line is virtually diffraction-limited volume scattered light is detected, the interferometric measuring arrangement is designed to superimpose the measuring light with external reference light and the evaluation unit is capable of the determined angular deviation with a vo To compare tolerance given in the result and the result of the Umfix ist of the fixation light source can generate a, based on the calculated angular deviation laterally displaced fixation mark or causes the biometric measurement.
  • the proposed technical solution is primarily intended for ophthalmic devices for the biometric measurement of the distances and radii in the eye, it can be used in principle for other devices in ophthalmology.
  • the eye is illuminated by a measuring light source with a measuring beam and by a fixing light source with a fixation mark, by an image sensor with the resulting reflections and by the position of the reflections with respect to the center of the Pupil or iris of an evaluation unit determines the angular deviation of the optical axis of the eye from the optical axis of the biometric measuring system.
  • the fixation light source must inevitably emit light in the visible spectral range
  • the measuring light source emits a measuring beam in a spectral range which is not visible to the patient, which considerably simplifies the evaluation of the recorded images.
  • the orientation of the biometric measuring system takes place by illuminating the eye in a first method step A) for repositioning of the, based on the calculated angular deviation of the Fixierlichtario with a laterally displaced fixation mark and in the next step B) of Image sensor is recorded with the resulting reflections.
  • the angular deviation of the optical axis of the eye from the optical axis of the biometric measuring system is determined from the position of the reflections with respect to the center of the pupil or iris and, according to method step D), by the evaluation unit with a predetermined one Tolerance compared.
  • the process steps are repeated A) to D), if the determined angular deviation exceeds a predetermined tolerance.
  • the alignment of the optical axis of the eye to the optical axis of the biometric measuring system by the visual axis of the eye is selectively changed by a corrected fixation.
  • step F the determination of various biometric parameters of an eye by in a further process step F) the reflected light from the eye detected in the form of quasi diffraction limited volume scattered light, in step G) as a measuring beam with an external reference beam superimposed on the measuring sensor passed and in the last step H. ) the interferometric measurement signals are evaluated by the evaluation unit.
  • FIG. 2 a flow chart of the method according to the invention shown.
  • the coaxial fixation mark is activated, imaged on the eye, recorded and evaluated together with the eye as a 'digital image and the tilt angle between visual axis and optical axis calculated'.
  • the 'coaxial fixation mark ' is deactivated , to which the patient had fixed his eye all the time. From the previously calculated tilt angle is now the position of a , calculated corrected fixation mark and the 'fixation mark activated at calculated position. The patient has to fix his eye again on this corrected fixation mark.
  • the fixation mark is recorded and evaluated with the eye as a 'digital image' and 'the tilt angle between the visual axis and the optical axis is calculated.
  • the predetermined tolerance is selected to be correspondingly small, it can be ensured that the optical axis of the biometric measuring system at least approximately coincides with the optical axis of an eye. Ideally, when the two axes actually collapse, the process would provide optimal measurement signals.
  • the biometric measurement based on the short-coherence interferometry is preferably carried out in such a way that the measurement light is detected at least approximately diffraction-limited and superimposed on the other with external reference light.
  • the eye is illuminated by the fixation light source with a fixation mark in the visible spectral range.
  • the image sensor for evaluation of the reflection image can detect either the reflection of the fixation light or the reflection of an additional IR light source, which can be arranged coaxially or, for example, annularly around the optical axis of the device.
  • the reflection image of the measurement light source can also be used to determine the angular deviation of the visual axis and the optical axis of the eye.
  • a second embodiment of the method provides that the eye is illuminated by the fixation light source with an axially displaceable fixation mark to compensate for the refractive error.
  • the required amount of axial displacement can be taken from the patient record and set on the biometric measuring system.
  • a third advantageous embodiment of the method takes into account the fact that the vast majority of patients have an eye structure deviating from the "ideal eye".
  • a large part of the patient's eyes has a tilting of the lens, which is a hindrance especially in the eye measurement. Therefore, the inventive method provides to illuminate the eye already at the beginning of the alignment of the fixation light source with a slightly laterally displaced fixation mark. This has the advantage that the automatic alignment is accelerated by the "omission" of the illumination with a coaxial fixation mark.
  • the average tilt of the eye lens is 2 ° -5 °.
  • the eye is illuminated by the measuring light source with a short-coherent measuring beam.
  • coherent radiation which has a fixed phase relationship with regard to its spatial and temporal propagation, has become established in ophthalmology, in particular in the interferometric distance measurement of reflective materials.
  • OCT optical coherence tomography
  • low coherence length light is used with the aid of an interferometer for distance measurement.
  • the aperture for the detection of the volume scattered light is narrowed accordingly.
  • This at least approximate, diffraction-limited detection has the advantage that the measurement light obtained from the volume scattered light uniformly remitted in substantially uniform directions has a high spatial selectivity.
  • a final embodiment of the method provides that the measurement light detected diffraction-limited is superimposed with external reference light.
  • the reference beam of the interferometer is coupled out before and not conducted into the eye.
  • the biometric measuring system is sensitive to possible movements of the patient's eye, but for superposition with the reference beam, only light components actually contain the depth information.
  • the method according to the invention is characterized in that a variable fixing mark is used whose lateral position can be variably adjusted by the optical axis of the measuring arrangement and that (approximately) diffraction-limited detected measuring light is superimposed with external reference light.
  • the inventive apparatus for interferometric determination of various biometric parameters of an eye consists of an interferometric measuring arrangement, a measuring light source for illuminating an eye with measuring light, a Fixierlichtán for illuminating the eye with a fixation, an image sensor for receiving the eye with the resulting reflections and an evaluation unit for Determination of the angular deviation of the optical axis of the eye from the optical axis of the biometric measuring system.
  • the fixing light source is designed so that the fixing mark to be generated is laterally displaceable.
  • the volume scattered light detected by an existing optics in the first place is superimposed as measuring light in the interferometric measuring arrangement with external reference light and imaged onto an existing measuring sensor.
  • the evaluation unit is able to compare the determined angular deviation with a predetermined tolerance and, as a result, to have a fixation mark laterally displaced on the basis of the calculated angular deviation produced by the fixation light source or to initiate the biometric measurement.
  • the fixation light source must inevitably emit light in the visible spectral range
  • the measuring light source emits a measuring beam in a spectral range which is not visible to the patient, which considerably simplifies the evaluation of the recorded images.
  • FIG. 3 a schematic diagram of the inventive device for determining various biometric parameters of an eye.
  • the device consists of an interferometric measuring arrangement with measuring light source and measuring sensor 2 , a fixing light source 3 with an imaging optics 8 , an image sensor 4 , an optics 5 for quasi diffraction-limited Detection of volume scattered light and an evaluation unit (not shown).
  • the illustration shows the aligned state in which the optical axis 6 of the eye and the biometric measuring system is identical, while the visual axis 7 of the eye 1, which is characterized by the fixing light, deviates therefrom.
  • the fixing light source is designed so that the fixing mark to be generated is laterally displaceable. Furthermore, a unit for generating a reduced detection aperture is provided and the interferometric measuring arrangement for superimposing the measurement light with external reference light is formed. The evaluation unit is also able to compare the determined angular deviation with a predetermined tolerance and, as a result, to generate a fixation mark laterally displaced on the basis of the calculated angular deviation from the fixation light source or to initiate the biometric measurement.
  • a laterally displaced fixation mark is generated for the purpose of repositioning the fixation light source on the basis of the angular deviation calculated by the evaluation unit, imaged on the eye and recorded by the image sensor with the resulting reflections.
  • the evaluation unit is able to determine from the position of the reflections with respect to the center of the pupil or iris the angular deviation of the visual axis from the optical axis of the biometric measuring system and to compare it with a predetermined tolerance. As a result of this comparison, the evaluation unit, in the event that the determined angular deviation exceeds a predetermined tolerance, causes the fixing light source to generate a laterally displaced fixing mark on the basis of the calculated angular deviation.
  • the alignment of the optical axis of the Eye to the optical axis of the biometric measuring system by the visual axis of the eye is selectively changed by a corrected fixation.
  • the evaluation unit initiates the determination of different biometric parameters of an eye.
  • the unit for generating a reduced detection aperture ensures that the measurement light reflected by the eye is diffraction-limited detected in the form of volume scattered light, superimposed in the interferometric measurement arrangement with external reference light and imaged onto the measurement sensor.
  • the evaluation unit evaluates the interferometric measurement signals thus generated and calculates various biometric parameters of the eye.
  • the predetermined tolerance is selected to be correspondingly small, it can be ensured that the optical axis of the biometric measuring system almost coincides with the optical axis of an eye and approximately optimal measuring signals are generated.
  • the actual interferometric measurements, for determining the position of optical interfaces in the eye thus only take place when the biometric measuring system is set to the physiology of the patient. This is preferably done automatically by the proposed solution, in which the calculation and activation of the fixation mark laterally displaced by the fixation light source in the described manner takes place automatically and without the intervention of the operator.
  • the first advantageous embodiments of the device relate to the fixation light source used.
  • a fixation light source is used be generated by the fixing marks in the visible spectral range.
  • the fixing light source is designed as an LC display, an array of light sources or laterally displaceable individual light source.
  • the fixing light source it is also possible for the fixing light source to be arranged coaxially, for example annularly around the optical axis of the device.
  • ametropia of the patient's eye to be measured leads to the fact that the fixation mark is not formed sharply on the fundus of the eye and the patient may have problems with its fixation. It is therefore advantageous if the fixation light source has a device for imaging an axially displaced fixation mark in order to compensate for ametropia. The required amount of axial displacement can be taken from the patient record and set on the biometric measuring system.
  • an imaging optics in the form of a zoom lens can be used.
  • the device for imaging an axially displaced fixing mark an actuator for the axial displacement of the fixing light source or an imaging optics.
  • the proposed device can be used Accelerate the alignment of the optical axis of the biometric measuring system to the optical axis of the eye.
  • the fixation light source causes already at the beginning of the alignment to produce a slightly laterally displaced fixation mark and to image it on the eye.
  • This has the advantage that the automatic alignment is accelerated by the "omission" of the illumination with a coaxial fixation mark.
  • the average tilt of the eye lens is 2 ° -5 °.
  • the second advantageous embodiments of the device relate to the measuring light source used.
  • the measuring light source is preferably a measuring light source emitting a short-coherent measuring beam.
  • coherent radiation which has a fixed phase relationship with regard to its spatial and temporal propagation, has become established in ophthalmology, in particular in the interferometric distance measurement of reflective materials.
  • OCT optical coherence tomography
  • low coherence length light is used with the aid of an interferometer for distance measurement.
  • the second advantageous embodiments of the device relate to the unit used to produce a reduced detection aperture.
  • the unit is for example a diaphragm or a single-mode fiber.
  • This at least approximate, diffraction-limited detection has the advantage that the measurement light obtained from the volume scattered light uniformly remitted in substantially uniform directions has a high spatial selectivity.
  • the diffraction-limited detected measuring light is superimposed in the interferometric measuring arrangement with external reference light.
  • the reference beam of the interferometer is coupled out before and not conducted into the eye.
  • the device is characterized by the combination of a fixation light source, for generating a laterally displaceable fixation mark, a unit for generating a reduced detection aperture, an interferometric Measuring arrangement for superposition of the measuring light with external reference light and an evaluation unit which is able to compare the determined angular deviation with a predetermined tolerance and in its result for Umfixleiter of Fixierlichtán a, based on the calculated angular deviation, the generation of a laterally displaced fixation or to initiate the biometric survey.
  • a solution is provided for the interferometric determination of various biometric parameters of an eye, which provides accurate and reliable measured values and yet does not depend on a highly accurate alignment of the device with the eye of a patient.
  • the sufficiently good alignment of the optical axis of an interferometric measuring arrangement with respect to the optical axis of an eye preferably takes place automatically, wherein both tilting or lateral displacements of the patient's eye as well as his refractive error in the alignment can be taken into account.
  • the present invention relates to a solution for the interferometric determination of various biometric parameters of an eye, in which the optical axis of the biometric measuring system is aligned with the optical axis of the eye of an eye and ideally coincides with it.
  • the biometric measurement based on the short-coherence interferometry is preferably carried out in such a way that the measurement light is detected at least approximately diffraction-limited and superimposed on the other with external reference light.

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Claims (16)

  1. Procédé pour déterminer des paramètres biométriques différents d'un oeil par interférométrie, dans lequel l'oeil est éclairé par une source de lumière de mesure au moyen d'un faisceau de mesure et par une source de lumière de fixation avec un repère de fixation, l'oeil est acquis par un capteur d'image à partir des réflexions occasionnées et l'écart angulaire de l'axe optique de l'oeil par rapport à l'axe optique du système de mesure biométrique est déterminé à partir de la position des réflexions par rapport au centre de la pupille ou de l'iris par une unité d'évaluation, dans lequel
    avant la détermination des différents paramètres biométriques, l'orientation du système biométrique est effectuée par les opérations suivantes :
    A) l'oeil éclairé par la source de lumière de fixation avec un repère de fixation décalé latéralement pour la refixation de la sur la base de l'écart angulaire calculé,
    B) l'oeil acquis par le capteur d'image au moyen des réflexions occasionnées,
    C) l'écart angulaire de l'axe optique de l'oeil par rapport à l'axe optique du système de mesure biométrique déterminé à partir de la position des réflexions par rapport au centre de la pupille ou de l'iris, caractérisé en ce qu'en outre :
    D) l'écart angulaire déterminé est comparé par l'unité d'évaluation à une tolérance prédéfinie, et
    E) les étapes de procédé A) à D) sont répétées lorsque l'écart angulaire déterminé dépasse une tolérance prédéfinie, et
    sinon, la détermination de différents paramètres biométriques d'un oeil est effectuée par les opérations suivantes :
    F) la lumière de mesure réfléchie par l'oeil est détectée sous la forme d'une lumière diffusée en volume quasiment limitée par la diffraction,
    G) elle est superposée en tant que faisceau de mesure à un faisceau de référence externe, et est acheminée à un capteur de mesure, et
    H) des signaux de mesure interférométriques sont évalués par l'unité d'évaluation.
  2. Procédé selon la revendication 1, caractérisé en ce que l'oeil est éclairé par une lumière de fixation provenant d'une source de lumière de fixation émettant de la lumière visible.
  3. Procédé selon au moins l'une des revendications 1 et 2, caractérisé en ce que l'oeil est éclairé par la source de lumière de fixation avec un repère de fixation décalé axialement pour compenser son défaut de vision.
  4. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que l'oeil est éclairé par la source de lumière de fixation avec un repère de fixation légalement décalé latéralement au début de l'orientation en tenant compte d'une inclinaison moyenne du cristallin de 2-5°.
  5. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que l'oeil avec des réflexions occasionnées est acquis est acquis par un capteur d'image à résolution spatiale.
  6. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que les étapes de procédé A) à D) sont effectuées encore une fois pour augmenter la fiabilité des valeurs de mesure obtenues à partir du faisceau de mesure réfléchi par l'oeil.
  7. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que l'oeil est éclairé par la source de lumière de mesure avec un faisceau de mesure à faible longueur de cohérence.
  8. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que la lumière diffusée en volume est principalement détectée par une optique.
  9. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que le faisceau de référence externe de l'interféromètre est préalablement couplé en sortie et n'est pas guidé vers l'oeil.
  10. Dispositif pour déterminer des paramètres biométriques différents d'un oeil (1) par interférométrie, constitué d'un système de mesure interférométrique, d'une source de lumière de mesure destinée à éclairer l'oeil (1) avec une lumière de mesure, d'une source de lumière de fixation (3) destinée à éclairer l'oeil (1) avec un repère de fixation, d'un capteur d'image (4) destiné à acquérir l'oeil (1) au moyen des réflexions occasionnées et d'une unité d'évaluation destinée à déterminer l'écart angulaire de l'axe optique (6) de l'oeil par rapport à l'axe optique du système de mesure biométrique, caractérisé en ce que la source de lumière de fixation (3) est réalisée de manière à ce que le repère de fixation à générer puisse être décalé latéralement, en ce qu'une optique présente (5) est réalisée de manière à ce qu'une lumière diffusée en volume quasiment limitée par la diffraction soit principalement détectée, en ce que le système de mesure interférométrique est réalisé de manière à superposer la lumière de mesure à une lumière de référence externe et comporte un capteur de mesure et en ce que l'unité d'évaluation est conçue pour comparer l'écart angulaire déterminé à une tolérance prédéfinie et, en fonction du résultat, pour la fixation d'une source de lumière de fixation (3), provoque la génération d'un repère de fixation décalé latéralement sur la base de l'écart angulaire calculé, ou déclenche la mesure biométrique.
  11. Dispositif selon la revendication 10, caractérisé en ce que la source de lumière de fixation (3) générant un repère de fixation visible est de préférence un afficheur à cristaux liquides, un réseau de sources de lumière ou une source de lumière individuelle pouvant être décalée latéralement.
  12. Dispositif selon au moins l'une des revendications 10 à 11, caractérisé en ce que la source de lumière de fixation (3) comporte un dispositif destiné à former l'image d'un repère de fixation décalé axialement pour compenser son défaut de vision.
  13. Dispositif selon la revendication 12, caractérisé en ce que le dispositif destiné à former l'image d'un repère de fixation décalé axialement est une optique de formation d'image (8) sous la forme d'un objectif à focale variable ou un actionneur permettant le décalage axial de la source de lumière de fixation (3) ou d'une optique de formation d'image (8).
  14. Dispositif selon la revendication 10, caractérisé en ce que le capteur d'image (4) est un capteur d'image à résolution spatiale destiné à acquérir l'oeil (1) au moyen des réflexions occasionnées.
  15. Dispositif selon la revendication 10, caractérisé en ce que la source de lumière de mesure est une source de lumière de mesure émettant un faisceau de mesure à faible longueur de cohérence.
  16. Dispositif selon la revendication 10, caractérisé en ce que l'optique (5) destinée à la diffraction d'une lumière diffusée en volume quasiment limitée par la diffraction est une fibre monomode.
EP11764503.6A 2010-09-29 2011-09-15 Procédé et dispositif pour la détermination interférométrique de différents paramètres biométriques d'un il Active EP2621330B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010047053A DE102010047053A1 (de) 2010-09-29 2010-09-29 Verfahren und Vorrichtung zur interferometrischen Bestimmung verschiedener biometrischer Parameter eines Auges
PCT/EP2011/065999 WO2012041712A1 (fr) 2010-09-29 2011-09-15 Procédé et dispositif pour la détermination interférométrique de différents paramètres biométriques d'un œil

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EP2621330A1 EP2621330A1 (fr) 2013-08-07
EP2621330B1 true EP2621330B1 (fr) 2017-04-05

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US (1) US8965065B2 (fr)
EP (1) EP2621330B1 (fr)
JP (1) JP6026417B2 (fr)
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WO2017003719A2 (fr) 2015-06-30 2017-01-05 3M Innovative Properties Company Dispositif d'éclairage
DE102017203010A1 (de) * 2017-02-24 2018-08-30 Carl Zeiss Meditec Ag Verfahren und Anordnung zur hochauflösenden Topographie der Kornea eines Auges
JP7521375B2 (ja) 2020-10-23 2024-07-24 セイコーエプソン株式会社 記録装置

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JP3289953B2 (ja) 1991-05-31 2002-06-10 キヤノン株式会社 視線方向検出装置
JP3197038B2 (ja) * 1991-11-29 2001-08-13 株式会社トプコン 眼屈折力測定装置
US7303281B2 (en) * 1998-10-07 2007-12-04 Tracey Technologies, Llc Method and device for determining refractive components and visual function of the eye for vision correction
DE19857001A1 (de) * 1998-12-10 2000-06-15 Zeiss Carl Jena Gmbh Anordnung und Verfahren zur berührungslosen Messung der Achslänge, der Hornhautkrümmung und/oder der Vorderkammertiefe des Auges
JP4769923B2 (ja) 1998-12-10 2011-09-07 カール ツァイス メディテック アクチエンゲゼルシャフト 眼内レンズの計算に好適な、眼の軸方向長さ及び／又は角膜の曲率及び／又は前房深さを非接触的に測定するための一体化装置
US6396069B1 (en) 1999-06-25 2002-05-28 Macpherson David C. Topographer for real time ablation feedback having synthetic wavelength generators
EP1232377B1 (fr) 1999-11-24 2004-03-31 Haag-Streit Ag Procede et dispositif pour mesurer les proprietes optiques d'au moins deux secteurs distants l'un de l'autre dans un objet transparent et/ou diffusant
DE10108797A1 (de) * 2001-02-21 2002-09-05 Zeiss Carl Jena Gmbh Verfahren zur Ermittlung von Abständen am vorderen Augenabschnitt
DE10132378A1 (de) 2001-07-06 2003-04-24 Zeiss Carl Meditec Ag Verfahren und Vorrichtung zur Verfolgung von Augenbewegungen
DE10323920A1 (de) 2003-05-22 2004-12-16 Carl Zeiss Meditec Ag Verfahren und Anordnung zum Vermessen des vorderen Augenabschnitts
DE10349230A1 (de) 2003-10-23 2005-07-07 Carl Zeiss Meditec Ag Gerät zur interferometrischen Augenlängenmessung mit erhöhter Empfindlichkeit
FR2865370B1 (fr) * 2004-01-22 2006-04-28 Centre Nat Rech Scient Systeme et procede de tomographie in vivo a haute resolution laterale et axiale de la retine humaine
WO2005122872A2 (fr) * 2004-06-10 2005-12-29 Optimedica Corporation Procede et appareil de fixation ophtalmique par balayage
EP1785690A1 (fr) 2005-11-10 2007-05-16 Haag-Streit Ag Procédé et dispositif destiné à la détermination de valeurs géométriques d un objet
JP5032203B2 (ja) * 2007-05-24 2012-09-26 株式会社トプコン 眼底観察装置及びそれを制御するプログラム
JP5198831B2 (ja) * 2007-11-02 2013-05-15 株式会社ニデック 眼寸法測定装置
DE102008051272A1 (de) * 2008-10-10 2010-04-15 Carl Zeiss Meditec Ag Tiefenauflösende optische Kohärenzreflektrometrie
DE102009007732A1 (de) * 2009-02-05 2010-08-12 Carl Zeiss Meditec Ag Anordnung zur Darstellung einer Fixiermarke für ophthalmologische Untersuchungs- und/oder Behandlungsgeräte

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WO2012041712A1 (fr) 2012-04-05
DE102010047053A1 (de) 2012-03-29
US20130188843A1 (en) 2013-07-25
EP2621330A1 (fr) 2013-08-07
US8965065B2 (en) 2015-02-24
JP6026417B2 (ja) 2016-11-16
JP2013538634A (ja) 2013-10-17

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